Fan noise with G5 tower

[pgrif]

My 2.7ghz DP G5 is very noisy sometimes. I have run Thermal Calibration and thought that it would get fixed.
Any ideas?

 

[Xernicus]

What are your temperatures? I recommend Temperature Monitor from Bresink software: http://www.bresink.com/osx/LegacyProducts.html

For purposes of comparison, here is my 2.0DP at 60-100% CPU Load (I've been working on ripping a heavily damaged CD using Max)

 

[Surrat]

If you have a water cooled G5 like the 2.7, and your abnormal high fan speeds, it could be your cooling system has leaked. You should pull the cpu/water cooler module and check for leaks on the bottom of the cpu water blocks.

 

[Xernicus]

I forgot all about the LCS (Liquid Cooling System, and it's not water, but rather some nasty corrosive stuff) in the 2.7 DP... I guess I've been reading too many threads/posts about converting a 2.7 to a traditional heatsink air cooled system. :crazy: https://forums.macrumors.com/threads/1168036/

The LCS changes things a little bit (OK... quite a bit), but I'll offer what advice I can based on what I've researched- as I have never owned a G5 with a LCS. (one of these days I'll get around to purchasing one and rebuilding it just to see what's up.)

Your first step should be to check for leaks and identify which LCS your PM has in it. Apple shipped them with Delphi and Panasonic systems, of which the Delphi was much more unreliable.

Here's some articles with photos to help you identify potential leaks/damage:
http://www.xlr8yourmac.com/systems/G5_coolant_leaks.html
http://www.xlr8yourmac.com/systems/G5_CoolantLeak_Repair/G5_CoolantLeak_Repair_p1.html

And a MacRumors thread dating from 2011 about LCS repair: https://forums.macrumors.com/threads/1109014/

If your LCS is not leaking, then my best guess would be that you need to apply new thermal paste to the CPU(s) and the U3 heatsink (especially).

 

[gavinstubbs09]

The 2.7 is and always will be loud. Even after rebuilding the Liquid Cooling System several times over that has no effect to fan noise, including new thermal paste.

If you'd like a quieter machine find a set of 2.0/2.3GHz processors with heatsinks.

 

[pgrif]

G5 temps

The 2.7 is and always will be loud. Even after rebuilding the Liquid Cooling System several times over that has no effect to fan noise, including new thermal paste.

If you'd like a quieter machine find a set of 2.0/2.3GHz processors with heatsinks.

Here are the temps with the fans only running slightly.

2015-02-02 14:36:54 -0800

CPU A Die Temperature: 135.1℉/57.3℃
CPU B Die Temperature: 116.8℉/47.1℃
Drive Bay: 76.1℉/24.5℃
Main Logic Board Backside: 93.7℉/34.2℃
Memory Controller Heatsink: 159.3℉/70.8℃
Processor Card A Ambient: 79.7℉/26.5℃
Processor Card B Ambient: 79.2℉/26.2℃

 

[gavinstubbs09]

Here are the temps with the fans only running slightly.

2015-02-02 14:36:54 -0800

CPU A Die Temperature: 135.1℉/57.3℃
CPU B Die Temperature: 116.8℉/47.1℃
Drive Bay: 76.1℉/24.5℃
Main Logic Board Backside: 93.7℉/34.2℃
Memory Controller Heatsink: 159.3℉/70.8℃
Processor Card A Ambient: 79.7℉/26.5℃
Processor Card B Ambient: 79.2℉/26.2℃

That's actually extremely good. My 2.7 ran upwards of 170*F which was quite high for idle. My 2.3 right now is at 139/141*F with TenFourFox and Bittorrent open.